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High temperature singlet-based magnetism from Hund’s rule correlations

Uranium compounds can manifest a wide range of fascinating many-body phenomena, and are often thought to be poised at a crossover between localized and itinerant regimes for 5f electrons. The antiferromagnetic dipnictide USb(2) has been of recent interest due to the discovery of rich proximate phase...

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Detalles Bibliográficos
Autores principales: Miao, Lin, Basak, Rourav, Ran, Sheng, Xu, Yishuai, Kotta, Erica, He, Haowei, Denlinger, Jonathan D., Chuang, Yi-De, Zhao, Y., Xu, Z., Lynn, J. W., Jeffries, J. R., Saha, S. R., Giannakis, Ioannis, Aynajian, Pegor, Kang, Chang-Jong, Wang, Yilin, Kotliar, Gabriel, Butch, Nicholas P., Wray, L. Andrew
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6367396/
https://www.ncbi.nlm.nih.gov/pubmed/30733441
http://dx.doi.org/10.1038/s41467-019-08497-3
Descripción
Sumario:Uranium compounds can manifest a wide range of fascinating many-body phenomena, and are often thought to be poised at a crossover between localized and itinerant regimes for 5f electrons. The antiferromagnetic dipnictide USb(2) has been of recent interest due to the discovery of rich proximate phase diagrams and unusual quantum coherence phenomena. Here, linear-dichroic X-ray absorption and elastic neutron scattering are used to characterize electronic symmetries on uranium in USb(2) and isostructural UBi(2). Of these two materials, only USb(2) is found to enable strong Hund’s rule alignment of local magnetic degrees of freedom, and to undergo distinctive changes in local atomic multiplet symmetry across the magnetic phase transition. Theoretical analysis reveals that these and other anomalous properties of the material may be understood by attributing it as the first known high temperature realization of a singlet ground state magnet, in which magnetism occurs through a process that resembles exciton condensation.